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Author Topic: BSA 650L  (Read 1105 times)

Offline Rider52

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Re: BSA 650L
« Reply #20 on: Aug 29, 2019, 04:54:57 »
Sit on the bike, look to your left and then look down at the front motor mount lugs. The VIN should be stamped on the flat spot on the lug. It may be stamped very lightly and covered by paint.
Member
AMA, VJMC, AMCA

Projects
74 Yamaha TX650
3 Harleys in constant state of sorrow and a Buell
1978 Yamaha Chappy 80 burning up the highway
Cut my motor in half Sportster to Shortster
Rodekilt Revitalization 1977 Honda CB750 http://www.dotheton.com/forum/index.php?topic=76749.new#new

Offline Psychopasta

  • Posts: 32
Re: BSA 650L
« Reply #21 on: Sep 05, 2019, 18:14:19 »
So here's my current thinking on the Lightning project.

My goal is the minimum restore, get her running and roadworthy. To that end, and in no particular order:

1. Top end service, check valve timing and give it a general once over. I don't want to ask any questions I might not like the answer to, so I won't strip the engine down right now.I'll swap out the valve springs in any case, but won't go further than I obviously need to when the head's open.

My only uncertainly is the oil pump. I'm OCD about oil, and am thinking about the SRM oil pump. Can I install that with the engine still in the frame?

2. Wiring. I have zero confidence in 52 year old wiring, so I'm going to rewire it. I'll also make it 12V negative earth like the good Lord intended, and fit electronic ignition. I'm leaning towards Pazon but would be open to advice and experience from the forum.I'll need to add indicators cos I don't like not having them, and rebuild the headlamp shell and idiot light. Rather tha upgrade the alternator I'll use LED bulbs to minimize the draw from the system

3. I'm going to rebuild the front forks, just so I know what I've got. The forks are Betor units, and I don't know much about them so I want to have a good look and see what I've got.

4. I'll also rebuild both brakes and just see what condition the wheels are in. I'll swap out bearings as a matter of course.

5. The frame is in good shape, and doesn't need repainting, so I'll restrict myself to pulling the swing arm and changing the bearings.

6. New Hagon shocks, new tires, new exhaust, new handlebars.

7. General clean up and paint with VHT Gloss epoxy paint.

Any thoughts, experiences, suggestions?

Offline trek97

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Re: BSA 650L
« Reply #22 on: Sep 05, 2019, 19:52:39 »
Rather than VHT.  Try Spraymax 2k Glamour High gloss clear.

Offline Psychopasta

  • Posts: 32
Re: BSA 650L
« Reply #23 on: Sep 09, 2019, 22:54:59 »
Ah, British bikes...they put the side stand on the left, and the oil tank drain hole on the side at the right, so you have to lean the bike over and hold it the other way to the side stand in order to get all the oil out. Love it.

That gripe aside, the 'filter', if I can call it that looked fairly clean:



and it was time to get the bike up on the ramp. It doesn't have a center stand, so I just used a scissor jack at the rear of the frame, plus a wheel chock and some tie-downs to keep it all solid:





Here's a better close-up of the oily port:


and the dry one:


Current plan is get the top off and have a good look, then get the barrels off and have a good look, and then get the rest of the engine out of the frame for rebuilding. Stay tuned!

Offline Psychopasta

  • Posts: 32
Re: BSA 650L
« Reply #24 on: Sep 12, 2019, 01:30:45 »
Wife was out with her boozy mates tonight so I got a little Bitsa time. Took off the air filters and carbs:



On the RHS the bolts were so tight that the stud unscrewed from the cylinder head instead:


Red loctite on the carb mounting bolts:


LHS one came off without any trouble but I noticed its tickler is gone:


and the throttle cable has corroded solidly into the carb slide:


Soaked it in WD40 and left it for another day.

Sump plate came off:


and judging from the sheer volume of oil, I'd say it was wet-sumping. Seriously, more came out the sump than the tank! Filter looked OK, as did the oil itself:

 

Offline teazer

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Re: BSA 650L
« Reply #25 on: Sep 12, 2019, 13:53:10 »
That's probably a good thing that it wet sumped and maybe protected the bottom end from too much rust.

When you clean up the carbs and refit them, try to reface the mounting flange and use lock nuts and don't tighten them down too much.  Those crabs tend to bow when the nuts are tightened and then they leak air.

Offline Psychopasta

  • Posts: 32
Re: BSA 650L
« Reply #26 on: Sep 14, 2019, 22:06:30 »
So today was mainly about removing all the stuff so I can get clear access to the engine. My plan now is to do a full rebuild of the motor, so it has to come out of the frame, and a bunch of stuff has to move to allow that. The good news is that soaking the bike in WD40 when I first got it, and a few more times since, seems to have worked well, and I had no problems with undoing any bolts. Yet.

Anyway, off with all this:



Mr. Frodo! Thaat's a left-'anded Whitworth right there!

and off with this:

Lets the whole brake chain come off as a piece. Interestingly, there seems to be no bolt for this to screw into, and it seems to have been held in place by the rust. Held quite well, I might add.

Then another left'aanded Whitworth:

Removing the clutch inspection cover revealed some fine swarf-like material


Urgh. With the footpeg off, I could see a crack in the sidecover that had been masked by the footpeg:

The bigger ding I could see before, and I'm OK with, but I don't like the crack. Getting the cover off shows it's been supported from the rear by some JB Weld or similar:

Would welcome opinions on whether this is serviceable or scrap.


Offline Psychopasta

  • Posts: 32
Re: BSA 650L
« Reply #27 on: Sep 14, 2019, 22:23:20 »
Looking at the clutch, it seems that the clutch springs were not done up with the correct tool, or even a chisel with a divot ground in it

The screws are flush with where you could get it with an ordinary screwdriver, or a smaller one used on just one side with a hammer used to drift the screw round. Oh well. Everything else look OK:

On the other side, the timing cover came off easily

and looks fine at first glance. I pulled out the bodged wiring loom, ignition coils and mounting brackets, and removed all the oil lines from the tank. Then removed the screws holding the toolholder in:

Both the oil tank and toolholder are now free, but will not come out until I remove the rear fender I think. Then, 'twas beer o'clock and tools were downed for the day


Offline Psychopasta

  • Posts: 32
Re: BSA 650L
« Reply #28 on: Today at 06:46:56 »
So I got the rocker cover off today





Also took off the points to show the advance/retard


Not much to report, looks clean enough. In other news, the middle engine mounting bolt is MIA: